Sol-gel coatings doped with graphene nanoplatelets for improving the degradation rate and the cytocompatibility of AZ31 alloy for biomedical applications

Fernández-Hernán, J.P.; Torres, B.; López, A.J.; Martínez-Campos, Enrique; Rams, J.

doi:10.1016/j.surfcoat.2021.127745

Cited by 12 publications

(7 citation statements)

References 43 publications

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“…The inert substrates have various shapes such as tubes, [ 1–3 ] plates, [ 4–6 ] honeycombs, [ 7–9 ] and foams, [ 5,10–12 ] among others. In addition, the coating methods used to deposit thin films on substrates, such as washcoating, [ 8,13,14 ] sol–gel deposition, [ 2,15,16 ] electrophoretic deposition, [ 17,18 ] chemical vapour deposition (CVD), [ 5,19,20 ] powder plasma spraying, [ 21–23 ] and physical vapour deposition (PVD), [ 24–26 ] among others, are diverse. The most used coating materials are metallic oxides like Al 2 O 3 , Al 2 O 3 modified with La 2 O 3 or CeO 2 , ZnO, TiO 2 , CuO, SiO 2 , ZrO 2 , and other materials.…”

Section: Introductionmentioning

confidence: 99%

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Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

2022

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In order to determine the catalytic stability, PtSn structured catalysts supported on thin films of MgAl 2 O 4 or ZnAl 2 O 4 deposited on α-Al 2 O 3 spheres were studied through five reaction-regeneration cycles in the n-butane dehydrogenation. Bimetallic catalysts show good catalytic stability along the five reaction-regeneration cycles. Among the different synthesized catalysts, the PtSn/Sp-Zn-CN catalyst showed the best catalytic behaviour, showing very good values of yields to butenes and excellent catalytic stability along the cycles, even better than the one of a structured commercial catalyst used industrially for the dehydrogenation of paraffins. The characterization results by temperature-programmed reduction and X-ray photoelectron spectroscopy showed some modifications in the metallic phase of the catalysts after the cycles, mainly in the Sn/Pt surface ratios and in segregation effects in some catalysts. However, the transmission electron microscopy (TEM) results are conclusive in the sense that, after the cycles, the bimetallic catalysts maintained a very high proportion of particles with sizes between 1-2 nm, and therefore, preserved a high metallic dispersion. K E Y W O R D S catalytic stability, MgAl 2 O 4 , n-butane dehydrogenation, PtSn structured catalysts, ZnAl 2 O 4

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Section: Introductionmentioning

confidence: 99%

“…The most used coating materials are metallic oxides like Al 2 O 3 , Al 2 O 3 modified with La 2 O 3 or CeO 2 , ZnO, TiO 2 , CuO, SiO 2 , ZrO 2 , and other materials. [ 6,8,14,16,20,23,27–29 ]…”

Section: Introductionmentioning

confidence: 99%

Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

2022

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“…However, when the GNP content exceeded 0.05 wt%, GNPs formed aggregates in the coating, which became internal stress concentration points that generated cracks and irregular coating morphology, thus degrading protective properties. [ 17 ]…”

Section: Design Strategies Of Composite Nanocoatings On Mg Alloysmentioning

confidence: 99%

Composite Nanocoatings of Biomedical Magnesium Alloy Implants: Advantages, Mechanisms, and Design Strategies

Dai

Xiong

et al. 2023

Advanced Science

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The rapid degradation of magnesium (Mg) alloy implants erodes mechanical performance and interfacial bioactivity, thereby limiting their clinical utility. Surface modification is among the solutions to improve corrosion resistance and bioefficacy of Mg alloys. Novel composite coatings that incorporate nanostructures create new opportunities for their expanded use. Particle size dominance and impermeability may increase corrosion resistance and thereby prolong implant service time. Nanoparticles with specific biological effects may be released into the peri‐implant microenvironment during the degradation of coatings to promote healing. Composite nanocoatings provide nanoscale surfaces to promote cell adhesion and proliferation. Nanoparticles may activate cellular signaling pathways, while those with porous or core–shell structures may carry antibacterial or immunomodulatory drugs. Composite nanocoatings may promote vascular reendothelialization and osteogenesis, attenuate inflammation, and inhibit bacterial growth, thus increasing their applicability in complex clinical microenvironments such as those of atherosclerosis and open fractures. This review combines the physicochemical properties and biological efficiency of Mg‐based alloy biomedical implants to summarize the advantages of composite nanocoatings, analyzes their mechanisms of action, and proposes design and construction strategies, with the purpose of providing a reference for promoting the clinical application of Mg alloy implants and to further the design of nanocoatings.

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“…J.P. Fernández-Hernán et al [ 113 ] developed sol-gel coatings doped with different concentrations of COOH- functionalized graphene nanoplatelets and deposited them on the surface of AZ31 magnesium alloy substrates ( Figure 23 ). They studied the in vitro biocorrosion of the coated samples using Hanks’ solution as electrolyte and found that the lowest concentrations of COOH-GNPs (0.005 and 0.05 wt.%) improved the behavior of the sol-gel coatings against corrosion.…”

Section: The Sol-gel Process In the Biocompatibility Improvement Of M...mentioning

confidence: 99%

“…AM60B Al (5.5-6.5%), Mn (0.24-0.6%), Zn (0.22%) and <0.05% Si, Cu, Fe, Ni AZ31 Al (2.5-3.5%), Zn (0.6-1.4%), Mn (0.2%) and <0.1% Si, Cu, Ca, Fe, Ni Among all the different strategies that can be followed to achieve an improvement of biocompatibility for magnesium alloys, the application of coatings is very extended [109][110][111][112][113]. By applying coatings on the surface of a biodegradable material, it is possible to control the degradation rate of the implant, slowing down the release rate of the corrosion by-products generated during the biodegradation process, such as hydrogen in the case of magnesium alloys, and increasing the durability of the implants to guarantee that the treatment time is long enough to let the damaged tissues be healed before the loss of mechanical integrity of the implant.…”

Section: Alloy Compositionmentioning

confidence: 99%

The Role of the Sol-Gel Synthesis Process in the Biomedical Field and Its Use to Enhance the Performance of Bioabsorbable Magnesium Implants

Fernández-Hernán

Torres

López

et al. 2022

Gels

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In the present day, the increment in life expectancy has led to the necessity of developing new biomaterials for the restoration or substitution of damaged organs that have lost their functionalities. Among all the research about biomaterials, this review paper aimed to expose the main possibilities that the sol-gel synthesis method can provide for the fabrication of materials with interest in the biomedical field, more specifically, when this synthesis method is used to improve the biological properties of different magnesium alloys used as biomaterials. The sol-gel method has been widely studied and used to generate ceramic materials for a wide range of purposes during the last fifty years. Focused on biomedical research, the sol-gel synthesis method allows the generation of different kinds of biomaterials with diverse morphologies and a high potential for the biocompatibility improvement of a wide range of materials commonly used in the biomedical field such as metallic implants, as well as for the generation of drug delivery systems or interesting biomaterials for new tissue engineering therapies.

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Sol-gel coatings doped with graphene nanoplatelets for improving the degradation rate and the cytocompatibility of AZ31 alloy for biomedical applications

Cited by 12 publications

References 43 publications

Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

Composite Nanocoatings of Biomedical Magnesium Alloy Implants: Advantages, Mechanisms, and Design Strategies

The Role of the Sol-Gel Synthesis Process in the Biomedical Field and Its Use to Enhance the Performance of Bioabsorbable Magnesium Implants

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Sol-gel coatings doped with graphene nanoplatelets for improving the degradation rate and the cytocompatibility of AZ31 alloy for biomedical applications

Cited by 12 publications

References 43 publications

Stability studies of PtSn structured catalysts supported on thin layers of MAl2O4 (M: Mg, or Zn) for paraffins dehydrogenation reactions

Stability studies of PtSn structured catalysts supported on thin layers of MAl2O4 (M: Mg, or Zn) for paraffins dehydrogenation reactions

Composite Nanocoatings of Biomedical Magnesium Alloy Implants: Advantages, Mechanisms, and Design Strategies

The Role of the Sol-Gel Synthesis Process in the Biomedical Field and Its Use to Enhance the Performance of Bioabsorbable Magnesium Implants

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Product

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Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions

Stability studies of PtSn structured catalysts supported on thin layers of MAl₂O₄ (M: Mg, or Zn) for paraffins dehydrogenation reactions